Step 1: Prepare the Pancake Batter
- Separate the eggs: Carefully divide the egg whites and yolks into separate mixing bowls. Ensure the whites are free of any yolk, as even a small amount of fat can hinder whipping.
- Mix the yolks: To the bowl with the yolks, add milk, vanilla extract, and optional lemon zest. Whisk until smooth. Sift in the flour and baking powder, then mix until no lumps remain. Set aside.
- Whip the egg whites: Using a hand mixer, beat the whites on medium speed until frothy. Add vinegar or lemon juice to stabilize the meringue, then gradually sprinkle in the sugar. Continue beating until stiff peaks form. The meringue should be glossy and hold its shape when the beaters are lifted.
- Combine the mixtures: Gently fold one-third of the meringue into the yolk batter using a rubber spatula. This step lightens the batter. Add the remaining meringue and fold gently until the mixture is smooth and airy. Be careful not to overmix, as this can deflate the batter.
Step 2: Cook the Pancakes
- Prepare the pan: Heat a large nonstick skillet over low heat. Lightly grease the surface with neutral oil, wiping away any excess.
- Portion the batter: Use a large spoon, cookie scoop, or piping bag to portion the batter into tall mounds on the skillet. Aim for uniform sizes to ensure even cooking.
- Cook slowly: Cover the pan with a lid and let the pancakes cook for 7-8 minutes. Check the bottom to ensure it’s golden brown before flipping.
- Flip with care: Gently flip the pancakes using a spatula. Cover again and cook for an additional 5-6 minutes. The pancakes should be golden on both sides and cooked through.
Step 3: Optional Sweetened Whipped Cream
- Combine heavy cream, sugar, and vanilla in a chilled bowl.
- Whisk by hand or with a mixer until firm peaks form. Keep refrigerated until ready to serve.